Spring lifter



w. T. BICKMORE SPRING LIFTER Filed Dec. 28, 1925 Sept. 28 1926.

Patented Sept. 23, 1226.

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Application filed December 23, 1925. serial' vo. 77,906.

This invention realtes to spring compressing or actuating devices for use in conjunction with valves of power plants, and has for its primary object the provision of a device of this character which is extremely simple of construction and positive and quick of action so that the work of compressing the spring in advance of removing the valve for the purpose of grinding the seat or the valve can be carried on with dispatch-and with ease and convenience.

A further object of the invention is to pro- Vide a device of this character which can be quickly applied respectively to the spring and valve and maintained in proper axial alinement with respect thereto.

"With the above and other objects in view which will appear as the nature of the invention is better understood, the same consists in the improved construction and novel arrangements of parts which will hereinafter be fully described and particularly pointed out in the claims.

In the accompanying drawings has been illustrated a single and preferred form of the invention, it being, however, understood that no limitations are necessarily made to the precise structural details therein exhibited, but that changes, alterations, and modifications within the scope of the claims may be resorted to when desired.

Figure 1 is a view in side elevation of the device showing an application of same to the valve and spring of a power plant with the compressing element in a released position;

Fig. 2 is a view similar to Fig. 1 showing the spring compressing element in position to compress the spring;

Fig. 3 is a fragmentary elevation of the device with parts in section indicating their relative positions to release the compressing element;

Fig. 4 is a top plan view of the spring rest; and

Fig. 5 is a detail view partly in section and partly in elevation of certain of the parts indicating the cant dog in locked engagement with the sliding compressing element. a

In carrying the invention into practice, I preferably make use of a U-shaped frame 10 having parallel spaced apart arms 11 and 12, the latter terminating in a forked or bi fureated spring rest 13 as indicated in at.

l1 previded with verties l l'arranged in vertical alinement with the bifurcation of the rest 13.

the sleeve 14 and in order that the link may be guided and properly accommodated in its movements, it passes through along slot 20 in the arm 11, as clearly indicated in Fig. 3.

The lowerend of the link 19 is always dis posed beneath the arm 11 and at this point there is pivoted to the link at 21 a cant dog 22. This dog has a cylindrical aperture 23 arranged in constant coincidence with the bore of the sleeve 14 so as to accommodate" passage therethrough of a sliding springcompressing rod 2 1 which is cylindrical in crosssection. The lower end of the said rod is relatively pointed as indicated at 25.

The cant dog is provided with a flared tail 26 against which a leaf spring 27 bears so as to urge the dog in an angular position where its walls will properly coact with the side surfaces of the element 24 ratchet-like when the bell-crank lever 16 is rocked on its pivot. The spring 27 has one of its ends securely fixed at 28 to said link 19. The base or lower end of the guide sleeve 14 constitutes a horizontally disposed abutment surface 29, which is disposed in the direct path of upward movement of the pivoted. springpressed cant dog 22.

In the drawings, Figs. 1 and 2, I have in dicat-ed such parts of a well-known power plant that will make clear the ways and methods of using my device when compressing a valve spring, and on reference to Fig.

1 it will be observed that the arm 11 is manipulated to overlie the valve A, and the rest 13 of the arm 12 manipulated to underlie the lower end of the valve spring B, the latter surrounding the valve stem C in the customary manner. The bifurcated spring rest 13 and the pointed end 25 of the sliding compressing element 24 are now axially positioned with respect to the valve rod C, the point 25 of said element bearing centrally against the valve A. It will also be observed that the position of the parts, Figs. 1 and 3, renders the sliding compressing element 24 free. This is due to the fact that on the extreme upward movement of the cant dog 22, it has been brought against the abutment surface the f: t open ing 23 in parallelism with the side surfaces of said element 24. With the )arts in the above described position, the lever 16 is rocked in a downward direction as shown in Figs. 2 and 5. This has caused to be tilted the cant dog 2:2, and in consequence thereof the walls of the passage 23 are brought in ratchet-like engagement with the sides of the compressing element 24:. This action takes place the moment the lever 16 is tilted to release the cant dog from the abutment surface 29.

It accordingly follows that as the lever 16 moves downward, a corresponding movement is imparted to the compressing element 24:. This forces the point 25 against the valve A and advances the rest- 13 in an upward direction, whereby to compress the spring as indicated in Fig. 2. Vith the spring compressed, the pin D of the valve rod can be withdrawn so as to effect an entire removal of the valve A from its seat.

I claim:

1. A valve-spring lifter comprising a frame having aspring-engaging portion, a sliding valve-engaging element, and means for sliding said element while permitting same to bear against the valve, whereby to raise the spring-engaging portion against the spring to compress the latter, the means for sliding said element comprising a cant dog in coaction with said element, and means to cause said dog to be tilted with respect to the element.

2. A valve-spring lifter comprising a frame having a spring-engaging portion, a sliding valve engaging element, and means for sliding said element while permitting same to bear against the valve, whereby to raise the spring-engaging portion against the spring to compress the latter, the means for sliding said element comprising a springpressed cant dog in coaction with said element, and means to cause said dog to be tilted with respect to the element.

3. A valve-spring lifter comprising a frame having a spring-engaging portion. a sliding valve-engaging element carried by the frame, and means to respectively cause relative sliding movements between the' frame and said element and to lock the frame to the latter, including a dog coacting with the frame at one time to effect a release of the dog from the element and to positively grip the element at another time.

YVILLIAM T. BICKMORE. 

